Allow to exclude JAX-RS classes with annotations

docs/src/main/asciidoc/rest-json.adoc

@@ -605,6 +605,28 @@ If set to `true` (default) then a *single instance* of a resource class is creat
 If set to `false` then a *new instance* of the resource class is created per each request.
 An explicit CDI scope annotation (`@RequestScoped`, `@ApplicationScoped`, etc.) always overrides the default behavior and specifies the lifecycle of resource instances.
 
+== Include/Exclude JAX-RS classes with build time conditions
+
+Quarkus allows to include or exclude root resource, provider and feature classes directly thanks to build time conditions like it is possible with CDI beans.
+Indeed, the different JAX-RS classes can be annotated with profile conditions (`@io.quarkus.arc.profile.IfBuildProfile` or `@io.quarkus.arc.profile.UnlessBuildProfile`) and/or with property conditions (`io.quarkus.arc.properties.IfBuildProperty` or `io.quarkus.arc.properties.UnlessBuildProperty`) to indicate to Quarkus at build time under which conditions the JAX-RS classes should be included.
+
+In the following example, Quarkus includes the endpoint `sayHello` if and only if the build profile `app1` has been enabled.
+
+[source,java]
+----
+@IfBuildProfile("app1")
+public class ResourceForApp1Only {
+
+    @GET
+    @Path("sayHello")
+    public String sayHello() {
+        return "hello";
+     }
+}
+----
+
+Please note that if a JAX-RS Application has been detected and the method `getClasses()` and/or `getSingletons()` has/have been overridden, Quarkus will ignore the build time conditions and consider only what has been defined in the JAX-RS Application.
+
 == Conclusion
 
 Creating JSON REST services with Quarkus is easy as it relies on proven and well known technologies.

docs/src/main/asciidoc/resteasy-reactive.adoc

@@ -1790,3 +1790,25 @@ Or plain text:
 < 
 < {"name":"roquefort"} 
 ----
+
+== Include/Exclude JAX-RS classes with build time conditions
+
+Quarkus allows to include or exclude root resource, provider and feature classes directly thanks to build time conditions like it is possible with CDI beans.
+Indeed, the different JAX-RS classes can be annotated with profile conditions (`@io.quarkus.arc.profile.IfBuildProfile` or `@io.quarkus.arc.profile.UnlessBuildProfile`) and/or with property conditions (`io.quarkus.arc.properties.IfBuildProperty` or `io.quarkus.arc.properties.UnlessBuildProperty`) to indicate to Quarkus at build time under which conditions the JAX-RS classes should be included.
+
+In the following example, Quarkus includes the endpoint `sayHello` if and only if the build profile `app1` has been enabled.
+
+[source,java]
+----
+@IfBuildProfile("app1")
+public class ResourceForApp1Only {
+
+    @GET
+    @Path("sayHello")
+    public String sayHello() {
+        return "hello";
+     }
+}
+----
+
+Please note that if a JAX-RS Application has been detected and the method `getClasses()` and/or `getSingletons()` has/have been overridden, Quarkus will ignore the build time conditions and consider only what has been defined in the JAX-RS Application.

extensions/arc/deployment/src/main/java/io/quarkus/arc/deployment/BuildTimeEnabledProcessor.java

@@ -5,6 +5,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
+import java.util.function.BiConsumer;
 import java.util.function.BiFunction;
 
 import org.eclipse.microprofile.config.Config;
@@ -15,6 +16,7 @@
 import org.jboss.jandex.AnnotationValue;
 import org.jboss.jandex.DotName;
 import org.jboss.jandex.FieldInfo;
+import org.jboss.jandex.IndexView;
 import org.jboss.jandex.MethodInfo;
 import org.jboss.logging.Logger;
 
@@ -42,7 +44,8 @@ public class BuildTimeEnabledProcessor {
     private static final DotName UNLESS_BUILD_PROPERTY = DotName.createSimple(UnlessBuildProperty.class.getName());
 
     @BuildStep
-    void ifBuildProfile(CombinedIndexBuildItem index, BuildProducer<BuildTimeConditionBuildItem> producer) {
+    void ifBuildProfile(CombinedIndexBuildItem index, BuildProducer<BuildTimeConditionBuildItem> producer,
+            BuildProducer<EagerBuildTimeConditionBuildItem> producerEagerBuildItem) {
         Collection<AnnotationInstance> annotationInstances = index.getIndex().getAnnotations(IF_BUILD_PROFILE);
         for (AnnotationInstance instance : annotationInstances) {
             String profileOnInstance = instance.value().asString();
@@ -53,11 +56,13 @@ void ifBuildProfile(CombinedIndexBuildItem index, BuildProducer<BuildTimeConditi
                 LOGGER.debug("Disabling " + instance.target() + " since the profile value does not match the active profile.");
             }
             producer.produce(new BuildTimeConditionBuildItem(instance.target(), enabled));
+            producerEagerBuildItem.produce(new EagerBuildTimeConditionBuildItem(instance.target(), enabled));
         }
     }
 
     @BuildStep
-    void unlessBuildProfile(CombinedIndexBuildItem index, BuildProducer<BuildTimeConditionBuildItem> producer) {
+    void unlessBuildProfile(CombinedIndexBuildItem index, BuildProducer<BuildTimeConditionBuildItem> producer,
+            BuildProducer<EagerBuildTimeConditionBuildItem> producerEagerBuildItem) {
         Collection<AnnotationInstance> annotationInstances = index.getIndex().getAnnotations(UNLESS_BUILD_PROFILE);
         for (AnnotationInstance instance : annotationInstances) {
             String profileOnInstance = instance.value().asString();
@@ -68,6 +73,7 @@ void unlessBuildProfile(CombinedIndexBuildItem index, BuildProducer<BuildTimeCon
                 LOGGER.debug("Disabling " + instance.target() + " since the profile value matches the active profile.");
             }
             producer.produce(new BuildTimeConditionBuildItem(instance.target(), enabled));
+            producerEagerBuildItem.produce(new EagerBuildTimeConditionBuildItem(instance.target(), enabled));
         }
     }
 
@@ -78,7 +84,12 @@ void ifBuildProperty(BeanArchiveIndexBuildItem index, BuildProducer<BuildTimeCon
             public Boolean apply(String stringValue, String expectedStringValue) {
                 return stringValue.equals(expectedStringValue);
             }
-        }, index, producer);
+        }, index.getIndex(), new BiConsumer<AnnotationTarget, Boolean>() {
+            @Override
+            public void accept(AnnotationTarget target, Boolean enabled) {
+                producer.produce(new BuildTimeConditionBuildItem(target, enabled));
+            }
+        });
     }
 
     @BuildStep
@@ -88,13 +99,48 @@ void unlessBuildProperty(BeanArchiveIndexBuildItem index, BuildProducer<BuildTim
             public Boolean apply(String stringValue, String expectedStringValue) {
                 return !stringValue.equals(expectedStringValue);
             }
-        }, index, producer);
+        }, index.getIndex(), new BiConsumer<AnnotationTarget, Boolean>() {
+            @Override
+            public void accept(AnnotationTarget target, Boolean enabled) {
+                producer.produce(new BuildTimeConditionBuildItem(target, enabled));
+            }
+        });
+    }
+
+    @BuildStep
+    void ifBuildPropertyEager(CombinedIndexBuildItem index, BuildProducer<EagerBuildTimeConditionBuildItem> producer) {
+        buildProperty(IF_BUILD_PROPERTY, new BiFunction<String, String, Boolean>() {
+            @Override
+            public Boolean apply(String stringValue, String expectedStringValue) {
+                return stringValue.equals(expectedStringValue);
+            }
+        }, index.getIndex(), new BiConsumer<AnnotationTarget, Boolean>() {
+            @Override
+            public void accept(AnnotationTarget target, Boolean enabled) {
+                producer.produce(new EagerBuildTimeConditionBuildItem(target, enabled));
+            }
+        });
+    }
+
+    @BuildStep
+    void unlessBuildPropertyEager(CombinedIndexBuildItem index, BuildProducer<EagerBuildTimeConditionBuildItem> producer) {
+        buildProperty(UNLESS_BUILD_PROPERTY, new BiFunction<String, String, Boolean>() {
+            @Override
+            public Boolean apply(String stringValue, String expectedStringValue) {
+                return !stringValue.equals(expectedStringValue);
+            }
+        }, index.getIndex(), new BiConsumer<AnnotationTarget, Boolean>() {
+            @Override
+            public void accept(AnnotationTarget target, Boolean enabled) {
+                producer.produce(new EagerBuildTimeConditionBuildItem(target, enabled));
+            }
+        });
     }
 
-    void buildProperty(DotName annotationName, BiFunction<String, String, Boolean> testFun, BeanArchiveIndexBuildItem index,
-            BuildProducer<BuildTimeConditionBuildItem> producer) {
+    void buildProperty(DotName annotationName, BiFunction<String, String, Boolean> testFun, IndexView index,
+            BiConsumer<AnnotationTarget, Boolean> producer) {
         Config config = ConfigProviderResolver.instance().getConfig();
-        Collection<AnnotationInstance> annotationInstances = index.getIndex().getAnnotations(annotationName);
+        Collection<AnnotationInstance> annotationInstances = index.getAnnotations(annotationName);
         for (AnnotationInstance instance : annotationInstances) {
             String propertyName = instance.value("name").asString();
             String expectedStringValue = instance.value("stringValue").asString();
@@ -123,8 +169,7 @@ void buildProperty(DotName annotationName, BiFunction<String, String, Boolean> t
                     enabled = false;
                 }
             }
-
-            producer.produce(new BuildTimeConditionBuildItem(instance.target(), enabled));
+            producer.accept(instance.target(), enabled);
         }
     }
 

extensions/arc/deployment/src/main/java/io/quarkus/arc/deployment/EagerBuildTimeConditionBuildItem.java

@@ -0,0 +1,40 @@
+package io.quarkus.arc.deployment;
+
+import org.jboss.jandex.AnnotationTarget;
+
+import io.quarkus.builder.item.MultiBuildItem;
+
+/**
+ * A type of build item that is similar to {@link BuildTimeConditionBuildItem} but evaluated before
+ * processing the {@link AdditionalBeanBuildItem} in order to filter the beans thanks to build time conditions
+ * before actually adding them with a {@link AdditionalBeanBuildItem}.
+ *
+ * @see io.quarkus.arc.deployment.BuildTimeConditionBuildItem
+ * @see io.quarkus.arc.deployment.AdditionalBeanBuildItem
+ */
+public final class EagerBuildTimeConditionBuildItem extends MultiBuildItem {
+
+    private final AnnotationTarget target;
+    private final boolean enabled;
+
+    public EagerBuildTimeConditionBuildItem(AnnotationTarget target, boolean enabled) {
+        switch (target.kind()) {
+            case CLASS:
+            case METHOD:
+            case FIELD:
+                this.target = target;
+                break;
+            default:
+                throw new IllegalArgumentException("'target' can only be a class, a field or a method");
+        }
+        this.enabled = enabled;
+    }
+
+    public AnnotationTarget getTarget() {
+        return target;
+    }
+
+    public boolean isEnabled() {
+        return enabled;
+    }
+}

extensions/resteasy-reactive/quarkus-resteasy-reactive-common/deployment/src/main/java/io/quarkus/resteasy/reactive/common/deployment/ResteasyReactiveCommonProcessor.java

@@ -8,10 +8,12 @@
 import java.util.Optional;
 import java.util.Set;
 import java.util.function.Consumer;
+import java.util.stream.Collectors;
 
 import javax.ws.rs.RuntimeType;
 
 import org.jboss.jandex.AnnotationInstance;
+import org.jboss.jandex.AnnotationTarget;
 import org.jboss.jandex.ClassInfo;
 import org.jboss.jandex.DotName;
 import org.jboss.jandex.IndexView;
@@ -31,12 +33,14 @@
 import io.quarkus.arc.deployment.AnnotationsTransformerBuildItem;
 import io.quarkus.arc.deployment.BeanArchiveIndexBuildItem;
 import io.quarkus.arc.deployment.BeanContainerBuildItem;
+import io.quarkus.arc.deployment.EagerBuildTimeConditionBuildItem;
 import io.quarkus.deployment.annotations.BuildProducer;
 import io.quarkus.deployment.annotations.BuildStep;
 import io.quarkus.deployment.builditem.CombinedIndexBuildItem;
 import io.quarkus.deployment.builditem.nativeimage.ReflectiveClassBuildItem;
 import io.quarkus.deployment.util.JandexUtil;
 import io.quarkus.resteasy.reactive.common.runtime.JaxRsSecurityConfig;
+import io.quarkus.resteasy.reactive.common.runtime.ResteasyReactiveConfig;
 import io.quarkus.resteasy.reactive.spi.AbstractInterceptorBuildItem;
 import io.quarkus.resteasy.reactive.spi.ContainerRequestFilterBuildItem;
 import io.quarkus.resteasy.reactive.spi.ContainerResponseFilterBuildItem;
@@ -71,9 +75,15 @@ void setUpDenyAllJaxRs(CombinedIndexBuildItem index,
 
     @BuildStep
     ApplicationResultBuildItem handleApplication(CombinedIndexBuildItem combinedIndexBuildItem,
-            BuildProducer<ReflectiveClassBuildItem> reflectiveClass) {
+            BuildProducer<ReflectiveClassBuildItem> reflectiveClass,
+            List<EagerBuildTimeConditionBuildItem> buildTimeConditions,
+            ResteasyReactiveConfig config) {
+        // Use the build time conditions in "eager mode" since we need to be able to filter the beans
+        // before actually adding them otherwise if we use normal build time conditions, we end up
+        // with a circular dependency
         ApplicationScanningResult result = ResteasyReactiveScanner
-                .scanForApplicationClass(combinedIndexBuildItem.getComputingIndex());
+                .scanForApplicationClass(combinedIndexBuildItem.getComputingIndex(),
+                        config.buildTimeConditionAware ? getExcludedClasses(buildTimeConditions) : Collections.emptySet());
         if (result.getSelectedAppClass() != null) {
             reflectiveClass.produce(new ReflectiveClassBuildItem(false, false, result.getSelectedAppClass().name().toString()));
         }
@@ -268,4 +278,16 @@ public void setupEndpoints(BeanArchiveIndexBuildItem beanArchiveIndexBuildItem,
         }
     }
 
+    /**
+     * @param buildTimeConditions the build time conditions from which the excluded classes are extracted.
+     * @return the set of classes that have been annotated with unsuccessful build time conditions.
+     */
+    private static Set<String> getExcludedClasses(List<EagerBuildTimeConditionBuildItem> buildTimeConditions) {
+        return buildTimeConditions.stream()
+                .filter(item -> !item.isEnabled())
+                .map(EagerBuildTimeConditionBuildItem::getTarget)
+                .filter(target -> target.kind() == AnnotationTarget.Kind.CLASS)
+                .map(target -> target.asClass().toString())
+                .collect(Collectors.toSet());
+    }
 }

extensions/resteasy-reactive/quarkus-resteasy-reactive-common/runtime/src/main/java/io/quarkus/resteasy/reactive/common/runtime/ResteasyReactiveConfig.java

@@ -34,4 +34,10 @@ public class ResteasyReactiveConfig {
     @ConfigItem(defaultValue = "true")
     @Experimental("This flag has a high probability of going away in the future")
     public boolean defaultProduces;
+
+    /**
+     * Allow to rely on build time conditions to enable or not the JAX-RS resource, provider and feature classes.
+     */
+    @ConfigItem(defaultValue = "true")
+    public boolean buildTimeConditionAware;
 }

extensions/resteasy-reactive/quarkus-resteasy-reactive/deployment/src/main/java/io/quarkus/resteasy/reactive/server/deployment/ResteasyReactiveProcessor.java

@@ -271,9 +271,7 @@ public void setupEndpoints(Capabilities capabilities, BeanArchiveIndexBuildItem
         Map<DotName, String> pathInterfaces = result.getPathInterfaces();
 
         ApplicationScanningResult appResult = applicationResultBuildItem.getResult();
-        Set<String> allowedClasses = appResult.getAllowedClasses();
         Set<String> singletonClasses = appResult.getSingletonClasses();
-        boolean filterClasses = appResult.isFilterClasses();
         Application application = appResult.getApplication();
 
         Map<String, String> existingConverters = new HashMap<>();
@@ -382,7 +380,7 @@ private boolean hasAnnotation(MethodInfo method, short paramPosition, DotName an
             serverEndpointIndexer = serverEndpointIndexerBuilder.build();
 
             for (ClassInfo i : scannedResources.values()) {
-                if (filterClasses && !allowedClasses.contains(i.name().toString())) {
+                if (!appResult.keepClass(i.name().toString())) {
                     continue;
                 }
                 ResourceClass endpoints = serverEndpointIndexer.createEndpoints(i);